Explain the use of variables in Qlik Sense.

The use of variables in Qlik Sense is primarily to store values that can be reused in expressions and visualizations, enhancing analysis efficiency and consistency. By defining a variable, you can assign it a specific value, be it a number, string, or expression. This allows analysts to write more concise and maintainable code because they can reference the variable instead of repeating the same value or calculation multiple times throughout their app.

For example, if a specific calculation or constant value is used frequently across several charts or KPIs, it can be defined as a variable. Any change made to this variable will automatically propagate to all references, ensuring that the analysis remains accurate and up-to-date without the need for multiple edits.

This functionality not only streamlines the development process but also reduces the potential for errors, as the same variable can be used across different visualizations and calculations rather than duplicating values or logic each time it's needed. The versatility of variables to hold different data types and forms in Qlik Sense further enhances their utility in creating dynamic and responsive visual analytics.